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Credit: AFP/Getty Images

(From L) Richard Cook, MSL deputy project manager, Pete Theisinger, MSL project manager and Adam Steltzner, MSL entry, descent and landing (EDL) of the Mars Science Laboratory (MSL) Curiosity Rover team celebrate at a press conference after the Mars Rover Curiosity successfully landed on the surface of the Red Planet on August 5, 2012 at the Jet Propulsion Laboratory in Pasadena, California. NASA's 2.5 billion USD Mars rover on August 5 sent back its first signals to mission control as it was about to enter the Red Planet's atmosphere in the final moments of a dramatic touchdown. AFP PHOTO / ROBYN BECK (Photo credit should read ROBYN BECK/AFP/GettyImages)